diff --git a/Serial/src/main.cpp b/Serial/src/main.cpp
index 773aff4..ea66c9b 100644
--- a/Serial/src/main.cpp
+++ b/Serial/src/main.cpp
@@ -2,3 +2,16 @@
 #include <avr/interrupt.h>
 #include <util/delay.h>
 
+
+void InitUSI(void) {
+  DDRB |= (0 << PB0); //set DI as input
+  USICR = 0 ; //disable USI
+  GIFR = 1 <<PCIF; //Clear pin change interupt flag
+  GIMSK |= 1<<PCIE; //Enable pin change interrupts
+  PCMSK |= 1<<PCINT0; //Enable pin change on pin 0
+
+
+}
+int main(void) {
+
+}
\ No newline at end of file